SX1211I084TRT(2007) Просмотр технического описания (PDF) - Semtech Corporation

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SX1211I084TRT
(Rev.:2007)

Lowest Power Integrated UHF Transceiver Short Range Devices

Semtech Corporation 

ADVANCED COMMUNICATIONS & SENSING

SX1211

Pmax-1dB circle

Max Power

Zopt = 30+j25 Ω

Figure 10: Optimal Load Impedance Chart

Please refer to the reference design section for an optimized PA load setting.

3.3.6.3. Suggested PA Biasing and Matching

The matching proposed is the following one:

VR_PA

100nH

47nF

PA

RFIO

SAW

Antenna

port

DC block

Low-pass and DC block

Figure 11: Suggested PA Biasing and Output Matching

Please refer to section 7 of this document for the optimized matching arrangement for frequency band.

V3.0 – august 15th, 2007

Page 21 of 73

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